US3689848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage-to-current converter
Assignee: United States Department of the Navy
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Filing: 1970-05-04
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Granted: 1972-09-05
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Expires: 1990-05-04
Abstract
Abstract A voltage-to-current converter circuit having a differential amplifier with one input coupled to receive voltage signals and an output coupled through transistors in Darlington configuration, the last of which is coupled in a current source circuit to produce a current output from the collector and a negative feedback from the emitter to the other input of the differential amplifier to supply current on the output directly proportional to the input voltage with thermal stability.
Inventors
- 👤 Philip R Geffe
- 👤 Sylvester C Tabisz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/40; H03H11/42; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
191 words
A solid state voltage-to-current converter circuit comprising: a single differential transistor amplifier having two inputs to base electrodes, two emitter coupled electrodes, and a collector output; a voltage signal input coupled to one input of said differential amplifier through a resistor, said one input being coupled through a biasing current source to a voltage source; a pair of emitter-to-base coupled transistors consisting of a driver transistor and an output transistor, the base of the driver transistor being coupled to said differential amplifier collector output, the emitter of said output transistor being coupled to the other input of said differential amplifier, and the collector of said output transistor constituting the output of said converter circuit; and current sources coupled to said differential amplifier emitter coupled electrodes and to said output transistor collector to provide current therefor and said voltage source coupled to the collectors of said differential amplifier transistors, to the collector of said driver transistor and through biasing resistors to said other base input of said differential amplifier and said base input of said driver transistor whereby the output current is directly proportional to the input voltage with good thermal stability.
Claim 2
Dependent Claim
191 words
A solid state voltage-to-current converter circuit comprising: a single differential transistor amplifier having two inputs to base electrodes, two emitter coupled electrodes, and a collector output; a voltage signal input coupled to one input of said differential amplifier through a resistor, said one input being coupled through a biasing current source to a voltage source; a pair of emitter-to-base coupled transistors consisting of a driver transistor and an output transistor, the base of the driver transistor being coupled to said differential amplifier collector output, the emitter of said output transistor being coupled to the other input of said differential amplifier, and the collector of said output transistor constituting the output of said converter circuit; and current sources coupled to said differential amplifier emitter coupled electrodes and to said output transistor collector to provide current therefor and said voltage source coupled to the collectors of said differential amplifier transistors, to the collector of said driver transistor and through biasing resistors to said other base input of said differential amplifier and said base input of said driver transistor whereby the output current is directly proportional to the input voltage with good thermal stability.
References Cited (Backward Citations)
US3316423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |